<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    >
    </el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKeys"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            Append
          </el-button>
          <el-button type="text" size="mini" @click="() => edit(data)">
            Edit
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      title="提示"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import Vue from "vue";
export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      category: {
        // name: "",
        // parentCid: 0,
        // catLevel: 0,
        // showStatus: 1,
        // sort: 0,
        // catId: null,
        // icon: null,
        // productUnit: null,
      },
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogVisible: false,
      dialogType: "",
      menus: [],
      expandedKeys: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  methods: {
    batchDelete() {
      //let checkedNodes =this.$refs.menuTree.getCheckedNodes();
      let catIds = this.$refs.menuTree.getCheckedKeys();
      console.log("被选中的元素", catIds);
      this.$confirm(`是否删除[${catIds}]菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl("/product/category/delete"),
          method: "post",
          data: this.$http.adornData(catIds, false),
        }).then(({ data }) => {
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          //刷新出新的菜单
          this.getMenus();
        });
      });
    },
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "修改成功!",
        });
        //从新请求数据
        this.getMenus();
        //设置需要默认展开的菜单
        this.expandedKeys = [this.pCid];
        this.updateNodes = [];
        this.maxLevel = 0;
        //this.pCid = 0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("tree drop: ", draggingNode, dropNode, dropType);

      //1.当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid = dropNode.parent.data.catId || 0;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }

      this.pCid.push(pCid);

      //2.当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点层级发生变化
            catLevel = siblings[i].level;
            //修改子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }

      //3.当前拖拽节点的最新层级
    },

    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < array.length; i++) {
          let cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    allowDrop(draggingNode, dropNode, type) {
      console.log("节点信息", draggingNode, dropNode, type);
      this.countNodeLevel(draggingNode);
      //当前正在拖动的节点+父节点所在的深度不大于3
      let deep = Math.abs(this.maxLevel - draggingNode.level + 1);
      console.log("深度", deep);

      //this.maxLevel
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      //找到所有子节点,求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
        }
        this.countNodeLevel(node.childNodes[i]);
      }
    },
    submitData() {
      if (this.dialogType == "add") {
        console.log("add天剑");
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        console.log("add修改");
        this.editCategory();
      }
    },
    //修改三级分类
    edit(dataIn) {
      this.dialogVisible = true;
      this.dialogType = "edit";
      this.title = "修改分类";
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${dataIn.catId}`),
        method: "get",
      }).then(({ data }) => {
        //请求成功
        console.log("要回显的数据", data);
        this.category = data.category;
      });
    },
    //修改三级分类方法
    editCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "修改成功!",
        });
      });
      //关闭对话框
      this.dialogVisible = false;
      //从新请求数据
      this.getMenus();
      //设置需要默认展开的菜单
      console.log("设置需要默认展开的菜单", this.category);
      this.expandedKeys = [this.category.parentCid];
      console.log("修改的三级分类数据", this.category);
      this.category = {};
    },

    append(data) {
      console.log("传过来的", data);
      console.log("data", data);
      this.category = {};
      this.dialogVisible = true;
      this.dialogType = "add";
      this.title = "添加分类";
      this.categorycatLevel = 0;
      this.category.sort = 0;
      this.category.showStatus = 1;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
    },
    //添加三级分类方法
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "添加成功!",
        });
      });
      //关闭对话框
      this.dialogVisible = false;
      //从新请求数据
      this.getMenus();
      //设置需要默认展开的菜单
      this.expandedKeys = [this.category.parentCid];
      console.log("提交的三级分类数据", this.category);
      //this.category = {};
    },
    // 获取数据列表
    getMenus() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log(data.data);
        this.menus = data.data;
      });
    },

    remove(node, data) {
      console.log("删除", node, data);
      console.log("node", node.parent.data.catId);
      console.log("data", data.parentCid);
      let ids = [data.catId];
      this.$confirm(`是否删除[${data.name}]菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            this.$message({
              type: "success",
              message: "删除成功!",
            });
            //刷新出新的菜单
            this.getMenus();
            //设置需要默认展开的菜单
            this.expandedKeys = [node.parent.data.catId];
          });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
  },
  created() {
    this.getMenus();
  },
};
</script>

<style>
</style>
